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An atom is the minimum particle in a component while a mixture of two or more atoms procedures a molecule. Whereas molecules can be wrecked down to distinct atoms, atoms cannot hereafter recall the properties of the element. Both the molecule and atom are infinitesimal hence cannot be observed by the bare eye.

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Atom is smallest unit which consisit of proton, neutron and surrounded by electron. No of proton is always equal to no of electron and thus atom is no charge. 
For examples H, C, O, N are atoms. 

Molecule is combination of atoms with bond. Molecule is created by bonded atoms when electrons fill up the outer orbit of each atom. 
For example H2, CO2, N2 
H : H 
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